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I copied this rule directly from Umbraco documentation, but it doesn't work.

I sometimes get redirected to www. and sometimes not. The negates don't work - which especially causes a problem on localhost. 

The only other rule (HTTP to HTTPS) is working.

 <rule name="Redirect to www prefix" stopProcessing="true">
  <match url=".*" />
  <conditions>
    <add input="{HTTP_HOST}" pattern="^www\." negate="true" />
    <add input="{HTTP_HOST}" pattern="^localhost(:[0-9]+)?$" negate="true" />
    <add input="{HTTP_HOST}" pattern="\.umbraco\.io$" negate="true" />
  </conditions>
  <action type="Redirect" url="https://www.{HTTP_HOST}/{R:0}" />
</rule>
Version: Umbraco Cloud 13.x

What have you used that works?